JPS5844635B2 - Method of brazing metal and ultra-hard artificial material and brazing agent therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of soldering metal and an ultra-hard man-made material, and a soldering agent therefor.

The invention is advantageously used, inter alia, for soldering cutting elements composed of diamond-based or boron nitride-based materials and metals in order to produce cutting tools and grinding tools therefrom.

It is now known in the art to use a wide variety of new man-made ultrahard materials such as diamond-based, boron nitride threads, etc. as cutting elements in cutting and grinding tools.

Unlike natural diamond, the new ultrahard material is characterized by a low hexagonal transition temperature, high brittleness, improved chemical stability and a coefficient of thermal expansion that is very different from that of the metal to which it is joined. Considering that
New soldering methods and new soldering agents that are most suitable for the materials are of great importance.

From what we know, traditional brazing and metallization
Processes and soldering agents for tallization are increasingly meeting the requirements of the new materials for producing cutting and grinding tools.

For example, it consists of pouring a liquid solder into a slit between a natural diamond and a metal at a temperature of 900 to 1100 °C under reduced pressure, and the liquid solder is gold-tantalum, gold-niobium, silver-copper-titanium, and silver-copper-titanium. There are known processes consisting of alloys of titanium and alloys containing aluminum and silicon (French Patent No. 1,332,423; US Pat. No. 3,192,620; British Patent Nos. 932,729, 11
5166.6 and 2031913).

These methods establish adequate bond strength of the brazed joint.

Alternatively, diamond crystals are compacted into copper-tin-titanium powder (Japanese Patent Publication No. 44134/1983) or into a copper-tin chromium-tungsten alloy (US Pat. No. 1,114,353), and then liquid-phase sintered. This is also known.

This method also provides satisfactory bond strength of the brazed joint.

However, the above-mentioned known brazing techniques induce thermal stresses in the joint that cause cranking in particularly brittle ultra-hard material masses such as polycrystalline ultra-hard materials such as diamond or boron nitride threads. , not suitable for widespread application.

Furthermore, these methods use high pressure reduction equipment, which has a negative impact on economic efficiency.

Additionally, a metalizing coating of titanium and zirconium is applied to the solder surface of the ultra-hard material, which is applied under reduced pressure at a temperature sufficient to achieve adequate adhesion of the metallizing coating to the diamond. It is also known to braze metals and ultra-hard man-made materials by a technique in which the thus coated material is joined to the metal at a temperature equal to the melting point of the solder by the use of a vacuum-silver brazing alloy.

This method provides a joint brazing with strong reduced stress since the brazing alloy used is a ductile material.

However, the disadvantage of this method is that it is not reliable, although it does not reduce the bonding properties (adhesion), due to the high sensitivity of the titanium-zirconium coating to oxidation.

Moreover, the efficiency of this method is compromised by the use of high vacuum equipment.

The most common brazing alloys used for brazing and metallizing ultra-hard man-made materials are based on the copper-tin-titanium combination (Japanese Patent Publication No. 47-44134), which exhibits high adhesion to these materials.

The ultra-hard artificial material used in this prior art is diamond or boron nitride.

The above-mentioned known brazes have some drawbacks due to their low ductility, high brittleness, and coefficient of thermal expansion different from diamond or new ultrahard materials based on boron nitride.

That is, the thermal stresses created in the wax region cause lump cranking of the cutting element and rapid tool wear.

The present invention makes it possible to obtain high-strength and stress-free reliable soldered joints through the action of a special metallization coating on diamond-based and/or nitrided boron thread materials. metals and diamond-based and/or boron nitride-based materials (achieved by reducing the oxidation tendency of the coating) and thereby improving the efficiency of the wax treatment (by performing the wax treatment in air). An object of the present invention is to provide a method for soldering materials and a filtration adhesive.

According to the invention, therefore, a metallized coating is applied to a soldering surface of diamond-based and boron nitride-based materials in a manner sufficient to achieve adequate adhesion of said metallized coating to said material to be soldered. by using a brazing alloy having ductile properties and a melting point in the range up to 1000° C., and the metallized coating is applied at a temperature of 3.0 to 32.0% by weight of the coating. The diamond-based and nitrides account for the majority of metals with high adhesion activity for boron-based materials, and the rest are metals with low oxidation properties.
brazing diamond-based and boron nitride-based materials with metals, consisting of carrying out in air in the presence of a layer of liquid flux, especially intended for soldering with soldering materials (with a melting point above 0 ° C.) A method is provided.

The adhesion-active metals selected for metallization coatings of diamond-based and boron nitride-based materials are selected at temperatures that are acceptable for the chemical reaction of said metals with diamond and boron nitride (800°C to 800°C).
1000°C), while the non-adhesive active metal towards diamond and boron nitride primarily serves to protect the highly adhesive metal from oxidation. .

Excellent adhesion between metallized coatings and diamond-based and boron nitride-based materials is achieved by selecting optimal concentration ranges of adhesive and oxidation-resistant metals.

To improve the efficiency of the method, it is carried out in air.

In order to maintain the adhesion between the metallized coating and the diamond-based and boron nitride-based materials, the soldering method uses a liquid spelter specifically designed to braze metals at a low melting point (500-700°C). It is done in a layer of flux.

Metals showing high adhesive activity towards diamond-based and boron nitride-based materials are preferably chromium and/or tungsten, molybdenum, tantalum or titanium, while oxidation-resistant metals are copper and/or silver, tin, Preference is given to lead, nickel or conorct.

Among the highly adhesive metals, titanium is the most adhesive.

However, chromium, tungsten, molybdenum and tantalum are particularly effective since these metals combine high adhesion and greater oxidation resistance than titanium.

Furthermore, the metal combines low oxidation with high ductility (additional requirements for the method of the invention) and suitable wettability for brazing alloys.

In order to ensure adequate oxidation resistance of the metallized coating and solid bonding of the coating with the diamond-based and boron nitride-based materials, the coating process is preferably carried out in a two-step operation.

First, a hard metal coating is applied that exhibits high adhesion to diamond-based and nitride-based materials.

The components of this coating are diamond-based and boron nitride-based substances, and 800 to 1000 iodine under vacuum.

It reacts at temperatures of °C and gives high adhesion levels of metallized coatings.

The optimal layer thickness that contributes to high adhesion of this film is 0.0
It is between 0.005 and 0.001.

A further coating of hard metal is then applied which exhibits low oxidation properties and thus protects the adhesive metal from oxidation.

This layer exhibits adequate wetting properties for conventional brazing alloys.

The optimum thickness of this layer is in the range of 0.001 to 0.01 degrees.

An alternative method of applying similar highly adhesive and oxidation-resistant metallization coatings to diamond-based and boron nitride-based materials, which achieves the same effect as above, is molten metal.

Adhesion is achieved by chemisorption of the adhesive components from the melt onto the diamond-based or boron nitride-based materials and melt reaction under vacuum (or in a protective atmosphere) at temperatures acceptable for chemical reaction, and metallization. The coating is protected from oxidation by an outer alloy layer.

The optimum thickness of the metallized coating is 0.011 m and 0.5 m.
It is between mm.

Metallization of diamond-based or boron nitride-based materials can also be performed by the following suitable techniques.

That is, metal sputtering (sp
uttering) and a relatively cold specimen (T
Deposition of metal vapors at temperatures between 200 and 500° C.: Electrolytic deposition of metals on the material to be metallized and then baking of the metals to achieve the desired degree of adhesion; Substance soaking; applying a powder-like adhesive alloy paste made from a readily flammable glue base and then heat treating the paste to achieve a strong bond between the metallized layer and the surface. There are techniques such as this.

It is worth noting that a high degree of adhesion between the coating and the material surface is an important factor in the metallization process.

This requirement requires the use of adhesion-active metals for diamond-based and boron nitride-based materials, and the use of metallized materials.
The diamond or nitride is filled by firing at a temperature that allows a chemical reaction under vacuum (argon, helium) at the boron-adhesive metal interface.

The most preferred method is to use a hard metal solder (melting point 500-70
1 for 0.5-2.0 minutes at the soldering point using a liquid flux intended for soldering metals at 0°C).
0 to b This is a method of performing brazing at a heating and cooling rate of the surface.

Under the conditions of the method, oxygen is effectively squeezed from the metallized surface of diamond-based or boron nitride-based materials at temperatures above 500°C (the starting point for strong oxidation of the coating and breakdown of adhesive bonds). issued.

The most common Fusix has the following composition (% by weight):

Anhydrous boric acid 35 Anhydrous potassium fluoride 42 Potassium 7-fluoride borate 23 The composition has a melting point of 500°C and the properties of the composition do not change throughout the wax.

The object of the invention is achieved by providing a brazing material and a diamond-based and/or boron nitride-based material for soldering metals.

According to the invention, said brazing material is made of copper, tin, titanium, lead, 13-60 5-15 5-25 2-15 and molybdenum and/or tungsten or tantalum in the following amounts (% by weight): Consists of the remaining parts.

Copper-tin-titanium based brazing materials exhibit melting points of up to 1000°C, the temperature at which diamond and equiaxed boron nitride (wurtzite structure type) begin to undergo hexagonal transformation; Shows high adhesive activity against boronic substances.

The lead added to these wax components improves the flow and ductility of the alloy, while the tungsten, molybdenum, and tantalum reduce the coefficient of thermal expansion of the alloy and reduce the thermal expansion of diamond-based and boron nitride-based materials. approach the rate.

The tin to copper ratio is chosen to be consistent with the desired strength and melting point of the wax.

If the titanium content is less than 5% by weight, significant deterioration of the adhesion occurs, and if the titanium content is more than 25% by weight, undesirable embrittlement of the wax is accompanied.

More than 15% lead tends to significantly reduce the strength of the alloy.

More than 40% by weight of molybdenum and/or tungsten or tantalum increases the melting point of the wax, thereby increasing the transition preferably to the hexagonal modification of diamond and equiaxed (wurtzite structure type) boron nitrides. can occur.

Because the wax has a coefficient of thermal expansion close to that of diamond-based and boron nitride-based materials, the wax has a zero
．． 5-20% by weight of non-metallic fillers, 0.3-20% by weight of molybdenum, tungsten or tantalum are incorporated.

To increase the malleability of the wax, the non-metallic filler is a powder with a preferred particle size of 1 to 50 microns.

When the nonmetallic particles have such a particle size, fine pores remain in the solder and its malleability is improved.

The invention will now be described by describing exemplary embodiments in detail.

According to the present invention, a method for brazing metals with diamond-based and boron nitride-based materials is provided, which method includes applying a metallized coating to the post-soldering surface of the diamond-based and nitride-based materials. soldering is carried out by exposing the materials to be joined to a temperature sufficient to cause proper adhesion of the metallized coating to the materials), and also by exposing the materials to be joined to a temperature sufficient to cause proper adhesion of the metallized coating to the materials), and also by applying a solder joint exhibiting ductile properties and having a melting point of up to 1000°C. The metal is bonded to the metallized material by using the agent.

According to the present invention, the metallization coating consists of a metal (i.e. chromium and/or molybdenum, tantalum, tungsten or titanium) that exhibits high adhesion to diamond-based and boron nitride-based materials, which The proportion is from 3.0 to 32.0% by weight of the total coating, and the remainder of the coating is a metal that improves the oxidation resistance (ie copper and/or silver, lead, tin, nickel or cobalt).

The coating described above is applied by two operational steps.

In the first step, a hard metal coating with high adhesion activity towards diamond-based and boron nitride-based materials is formed with a coating of 0.00%
0.05 m to 0.001 m thick, followed by a hard metal coating to improve oxidation resistance.
The coating is applied to a thickness of 0.1 m.

Another method for applying metallized coatings uses metal melts consisting of metals with high adhesion to diamond-based and boron nitride-based materials and oxidation-resistant metals.
The thickness of the coating is 0°Olm to 0.5m.

The post-waxing operation consists of heating the surfaces to be joined in air under a layer of liquid flux for 0.5-2 minutes below the melting point of the wax.
~b It is done by doing.

This liquid flux is within the range of fluxes employed by metal spelters to solder metals.

The melting point of such a flux is in the range of 500-600°C; furthermore, it is stable in a temperature range up to 1000°C.

One of the acceptable fluxes (Flux A1) has the following composition (% by weight): Anhydrous boric acid 35 Anhydrous potassium fluoride 42 Potassium fluoride 23 The other 7 fluxes (42) It has similar properties to Todoroki 1 and has the following composition in weight percent.

Calcium fluoride borate Sodium tetraborate 0 1 In addition, the third possible flux (flux A3
) has the following strings (% by weight); Boron Tetraborate Sodium Oxyrate 0 0 In addition, a compound (flux shoe 4) consisting of the following strings in weight% is also possible: Sodium fluoride Zinc chloride A brazing agent for joining metals with metallization materials on lithium chloride potassium chloride diamond and equiaxed boron nitride has the following threads (% by weight): 13-60 5-15 Titanium 5 ~25 Furthermore, according to the invention, lead is 2-15 with the remainder being preempted from molybdenum and/or tungsten or tantalum.

Other equally effective braze joints have the following weight percentages: Copper 13-6 Tin
5-1 tita 7
5-2 Wax-insoluble non-metallic filler 0.5-2 filler, molybdenum and/or 0.3-20 tungsten or tantalum, non-metallic filler is powder with particle size from 1 micron to 50 micron It is a kind of thing.

The present invention will be better understood by the following specific examples.

Example 1 A polycrystalline polycrystalline polycrystalline polycrystalline type of boron nitride such as Nilbor (E 1bor ) with a diameter of 3.9 mm and a height of 4.4 mm and a steel holder with a diameter of 57 It 7 W and a height of 20 mm were used. solder each other.

Polycrystalline boron nitride was premetallized with a chromium layer by electron beam sputtering of the metal.

The adhesion has a layer thickness of 0,001 mm and a layer thickness of 1 to 5
The operation was carried out under a vacuum of 15" x 15" mmHg.

The polycrystalline was then given a protective coating of chemically bonded copper to a thickness of 0.005 mm.

The coating components were in a weight ratio of 80 parts copper to 20 parts chromium.

The semicrystals were then dried under vacuum (2-5 X 10'
mvtHg) for 20 minutes at 950°C.

Thereafter, the metallized polycrystal was placed in a cylindrical hole cut into the end face of the holder along the axis of the holder (at this time, the soldering slit was 0.15 m wide on the side).
It was 1.

) The soldering was carried out by high-frequency heating in air under a layer of flux AI, using a brazing agent consisting of 20% by weight tin and 80% by weight copper, with a heating and cooling rate of 20°C/s. performed the operation.

The treatment was carried out at a temperature of 900° C. for 1.5 minutes.

The wax melted and flowed into the soldering slit under the action of capillary forces.

The braze joint was flat with no cavities or cracks in the cutting element or other braze defects.

Thus, the adhesion of the braze to the polycrystal was satisfactory.

Example 2 A Nilboa polycrystal 4.2 inches in diameter and 4.6 inches high and a steel holder 5.5 inches in diameter and 20 mrIL in height are brazed together.

This polycrystal is produced by applying chemical precipitation. Pre-metallized with a 0.0008 mm chrome coating.

A protective coating of cobalt was then applied to the polycrystalline to a thickness of 0.005 mm by metal sputtering under vacuum.

The weight ratio of both parts was 15 parts chromium to 85 parts cobalt.

Apply 950° to this metallized coating at 1 to 5 x 10'mmHg.
C was vacuum fired for 30 minutes.

The metallized polycrystal was placed inside a cylindrical hole formed along its axis in the distal face of the steel holder.

The brazing slit was 0.10 m1 on the side.

The soldering was carried out in air under a 20 layer of flux A by radiofrequency heating using a solder made of 20% by weight tin and 80% by weight copper at a heating and cooling rate of 30° C./s for 1 minute. went.

The wax temperature was 900°C.

The soldering agent melted down and flowed into the soldering slit due to capillary force.

The resulting solder joints were flat, with no cavities or crevices in the cutting elements, or other solder defects.

Adhesion of the solder to the polycrystal was sufficient.

Example 3 A synthetic diamond carbonate polycrystal with a diameter of 3.5 mm and a height of 46 mm and a steel holder with a diameter of 5 mm and a height of 20 mm are brazed together.

The carbonate polycrystals were premetalized with a 0.0005 mm thick coating of tantalum by vacuum sputtering, which was then given a 0.01 mm coating of silver by the same method.

The weight ratio of the coating components was 3 parts tantalum to 97 parts silver.

This metallized coating was heated at 90°C in a vacuum of 1 to 5 x 10-5 Hg.
It was baked at 0°C for 15 minutes.

The metallized polycrystal was placed in a cylindrical hole formed along its axis in the distal face of the steel holder.

The soldering slits are 0.10 mm on the sides.

The soldering was carried out under a layer of flux A3 by radiofrequency heating using a solder made of 28% by weight copper and 72% by weight silver at a heating and cooling rate of 30° C./sec.
℃ for 0.7 minutes.

The wax melted and flowed into the soldering slit due to capillary force.

The resulting braze joint was flat, with no cavities or cracks in the cutting element, or other braze defects.

Adhesion of the wax to the carbonate was sufficient.

Example 4 A Nilboa polycrystal with a diameter of 4.1 mm and a height of 4.5 mm and a steel holder with a diameter of 5.5 mm and a height of 20 mm are brazed together.

The polycrystalline was coated with tantalum to a thickness of 0.001 mm by metal sputtering under vacuum, followed by a 0.005 mm thick coating of nickel using the same technique.

The weight ratio of the coating components was 20 parts tantalum to 80 parts nickel.

This metallized coating was heated in a vacuum of 1 to 5 x 10-5 Hg.
It was baked at 1000°C for 30 minutes.

The metallized polycrystal was then placed into a cylindrical hole formed in the end face of the holder along its axis.

The brazing slits were between 0.20 and 0.20 on the sides.

Soldering was carried out in air under a layer of flux A40 by radiofrequency heating using a solder made from 20 wt.% tin and 80 wt.% copper at a heating and cooling rate of 30° C./s for 1 minute. .

The wax temperature was 900°C.

The wax melted and flowed into the soldering slit due to capillary force.

The resulting braze joint was flat, with no cavities or cracks in the cutting element, or other braze defects.

The adhesion of the braze to Nilboa was satisfactory.

Example 5 A Nilboa polycrystalline 4.0 mm in diameter and 4.4 mm in height and a steel holder 5.0 mm in diameter and 20 mm in height are brazed together.

The polycrystalline was coated with molybdenum to a thickness of 0.0011 m by vacuum sputtering and then lead applied in the same manner to a thickness of 0.005 m7IL.

The weight ratio of the coating components was 10 molybdenum to 90 lead.

The metallized coating was fired at 700 DEG C. for 10 minutes in a vacuum of 1-5.times.10@-5 mrnHg.

The metallized polycrystal was then placed into a hole formed in the end face of the holder along its axis.

The brazing slits were 0.101 m on the sides.

The soldering was carried out by radiofrequency heating under a layer of flux A2 in air using a solder made from 15% by weight tin and 85% by weight copper at a heating and cooling rate of 1.5° C./sec. I went for a minute.

The wax temperature was 920°C.

The soldering agent melted down and flowed into the soldering slit due to capillary force.

The resulting braze joint was flat, with no cavities or cracks in the cutting element, or other braze defects.

Adhesion of the solder to Nilboa was sufficient.

Example 6 A polycrystalline carbonate having a diameter of 3.7 mm and a height of 4.7 mm and a steel holder having a diameter of 5 mm and a height of 20 mm are brazed together.

The carbonate polycrystalline was first coated with molybdenum to a thickness of 0.001 inch by vacuum sputtering and then coated with copper to a thickness of 0.01 U by electrolytic deposition.

The weight ratio of the coating components was 30 molybdenum to 70 copper.

This metallized coating was heated at 700 mHg in a vacuum of 1 to 5
It was baked at ℃ for 30 minutes.

The metallized polycrystal was then placed into a hole formed in the end face of the holder along its axis.

The brazing slits were 0.15Wx on the sides.

The soldering was carried out by radio frequency heating under a layer of flux A3 in air using a solder consisting of 28% by weight copper and 72% by weight silver at a heating and cooling rate of 30°C/sec.
It lasted 7 minutes.

The wax temperature was 800°C.

The wax melted and flowed into the soldering slit due to capillary force.

The resulting braze joint was flat, with no cavities or cracks in the cutting element, or other braze defects.

The adhesion of the wax to the carbonate was satisfactory.

Example 7 A Nilboa polycrystal with a diameter of 41ioa and a height of 4.5m is soldered to a steel support with a diameter of 5.5u and a height of 20m.

The polycrystal is made to a thickness of 0.0001 by vacuum sputtering.
It was pre-metalized with a tungsten coating of m and then similarly metallized with a copper coating.

The weight ratio of the coating was 20 tungsten to 80 copper.

The metallized coating is 1-5 x 100-5so at 1000℃
It was baked in an IH vacuum for 30 minutes.

The metallized polycrystal was placed in a hole raised in a cylindrical system made on the end face of the support along the axis of the support.

The brazing slits were 0.20 inches on the sides.

The brazing method uses 20% tin and 80% copper.
was subjected to high frequency heating for 1 minute at a heating and cooling rate of 30° C./sec to melt flux A4.

The filtrate temperature was 900°C. The wax melted down and entered the soldering slit by capillary action.

The resulting brazed joints were flat, with no cavities or cracks in the cutting elements, and no solder defects.

Adhesion of the wax to Nilboa was adequate.

Example 8 A Nilboa polycrystal with a diameter of 4-1 wx and a height of 4.5 u is brazed to a steel support with a diameter of 5.5 n and a height of 20 Iol.

Polycrystalline to a thickness of 0.0001 by vacuum sputtering
M was metallized with a tungsten coating and then similarly coated with tin.

The weight ratio of the coating components was 20 parts tungsten to 80 parts tin.

Metallized coating at 1000°C, l~5 x 10' m
Calcined in Hg vacuum for 30 minutes.

The metallized polycrystal was placed along the axis into a cylindrical hole formed in the end face of the support.

The brazing slit was 0.2 tm on the side.

The brazing method was carried out in air while melting flux 44 by high-frequency heating a solder made of 20% by weight tin and 80% by weight copper at a heating and cooling rate of 30° C./sec for 1 minute.

The wax temperature was 900°C. The wax melted down and entered the soldering slit by capillary action.

The resulting braze joint was flat with no cavities or cracks in the cutting element, and no other braze defects.

Bonding of the wax to Nilboa was adequate. Example 9 A Nilboa polycrystal with a diameter of 4-1 wx and a height of 4-5 ioa is brazed to a steel support with a diameter of 6 wz and a height of 20 m.

The polycrystal has the following composition (wt%): 6Ti + 10Pb + 11.5 Sn + 7L5Cu + I
M.

The alloy coating was metallized in the form of a powdered paste kneaded with an organic adhesive that could be easily removed by incineration under vacuum.

The paste is applied with a brush to a thickness of lliom and the polycrystalline is heated at 900 °C in a vacuum of 1-5 x 10' w x Hg.
It was baked for 5 minutes at a temperature of .

The metallized polycrystal was placed along the axis into a cylindrical raised hole made in the end face of the support.

The brazing slits were 0.2 wx on the sides.

The brazing method was carried out in air by high-frequency heating of a solder made of 19% by weight tin, 78% by weight copper and 3% by weight nickel at a heating and cooling rate of 20° C./second while melting the flux AI.

The wax flowed into the soldering slit due to capillary forces as it melted down.

The wax temperature was 900°C.

The resulting braze joints were flat, free of cavities and cracks in the cutting elements, and free of other braze defects.

Bonding of the wax to Nilboa was adequate. Example 10 A carbonate polycrystal with a diameter of 3-5 m and a height of 4.2 m is brazed to a steel support of 5.5 sct in diameter and 20 mm in height.

First, the polycrystal was metallized with an alloy coating having the following composition (% by weight): 10Ti + 12Pb + 7Sn + 68Cu + 3W.

The coating is polycrystalline at a temperature of 900°C, l~5xl10-5I
It was applied by dipping into a vacuum melt of lxH.

The metallized polycrystal was placed along the axis into a cylindrically raised hole in the end face of the support.

The brazing slits were 0.1511 on the sides.

Brazing is copper 70: iron 0.1: lead 0.03; bismuth 0.
002; Antimony 0.05; A composition made from residual zinc was subjected to high frequency heating and heated in air while melting with a flux torch 2.

Heating and cooling rates were 30°C/sec.

The wax temperature was 850°C.

The wax melted down and flowed into the soldering slit by capillary forces.

The resulting solder joint was flat, free of cavities and cracks in the cutting element, and free of other solder defects.

Bonding of the wax to the carbonate was adequate. Example
11. A hexanite polycrystal with a diameter of 5.0 itm and a height of 5.1 mm is soldered to a steel support with a diameter of 8 IEl and a height of 20 wm.

Hexanite polycrystal has the following composition (wt%): 8Ti+12
Metallized with an alloy coating having Pb+11Sn+49Cu+20Ta.

The alloy in the form of a powdered paste, kneaded with an organic adhesive that can be easily removed by incineration under vacuum, is applied with a brush to a thickness of 0.5 m, and then the polycrystalline is coated at a temperature of 900° C. with 1 to 5×11
It was baked for IO minutes under a vacuum of 0-5 ittH.

The metallized polycrystal was placed in a cylindrical raised hole made along the axis on the end face of the support.

The brazing slits were 0.2 wx on the sides.

The brazing method was carried out in air by high-frequency heating of a solder consisting of 20% by weight tin and 80% by weight copper at a heating and cooling rate of 20° C./second while melting flux A3.

The wax melted down and flowed into the soldering slit by capillary forces.

The filtrate temperature was 900°C.

The resulting braze joints were free of cavities and cracks in the cutting elements, and were free of other braze defects.

Bonding of the wax to hexanite was adequate.

Example 12 Nirboa polycrystal with a diameter of 40 inches and a height of 4.5 inches and a diameter of 5 inches
A 5 m long, 20 mm high steel support is soldered.

First, the Nilboa polycrystal has the following composition (wt%) 6Ti+1
0Pb+10.5Sn+72.5Cu-+(), 3Mo
Metalized with an alloy coating having +0.7A 1203.

An alloy in the form of a powdered paste is kneaded with an organic adhesive that can be easily removed by incineration under vacuum, and is then brushed to a thickness of 0.2 m.
Applied.

The particle size of the aluminum oxide powder was 1 micron.

Then, the polycrystal is heated at a temperature of 900°C to 1 to 5
' Baked for 5 minutes under imHg vacuum.

The metallized polycrystal was placed in an axially raised cylindrical hole in the end face of the support.

The filter 5 contact slit was 0.2 mm on the side surface.

The brazing method was carried out in air by high-frequency heating of a solder made of 20% by weight tin and 80% by weight copper at a heating and cooling rate of 20° C./sec while melting flux A1.

The wax temperature was 900°C. The wax melted down and flowed into the soldering slit by capillary forces.

The resulting braze joints were free of cavities and cracks in the cutting elements, and were free of other braze defects.

Bonding of the wax to Nilboa was adequate.

Example 13 A carbonate polycrystal with a diameter of 316 m and a height of 4 Om and a steel holder with a diameter of 5.5 m and a height of 20 m are soldered together.

First, carbonate polycrystals were metallized with an alloy coating having the following composition.

(% by weight) 5Ti+10Pb+7Sn+58Cu+0.
5W + 19.58iC Under reduced pressure, a powdered alloy kneaded with an organic glue-based paste that can be easily combusted was used with a brush to form silicon carbide particles with a size of 7 microns and a thickness of 0.3 m.
It was applied so that

Next, this polycrystal is heated at a temperature of 900°C, 1 to 5 × 10
' Calcined for 5 minutes under reduced pressure of iotHg.

The metallized polycrystal was placed in a cylindrical borehole formed in the end face of the holder along the axis of the holder, and the solder slit was 0.15 m on the sides.

The post-brazing process was carried out in air under a melt of flux A2 using a high-frequency heating means using a wax having the following composition.

Copper 70; iron 0.1: lead 0.3: bismuth 0.002; antimony 0.05; balance zinc.

(wt%) Heating and cooling rate 30°C/sec, wax temperature 850°C/sec.

The wax melted and flowed into the wax slit by capillary action.

The resulting braze joint was flat and free of cavities and cracks in the cut piece as well as other solder defects and good adhesion of the wax to the carbonate.

Example 14 A hexanite polycrystal with a diameter of 5.5 mm and a height of 5.3 mm and a plate-shaped iron-nickel-copper alloy metal holder with a height of 8 mm and a size of 15 m x 15 mm are soldered together.

Hexanite polycrystals were preliminarily metallized with an alloy coating having the following composition.

7Ti+12Pb+11Sn+49Cu+20Ta+I
BN A powdered alloy kneaded with an organic glue-based paste that can be easily combusted under reduced pressure is mixed with a brush to a thickness of Q, 4.
mm (boron nitride powder has a particle size of 5 microns).

The polycrystal is then heated at a temperature of 900°C, 1~5X], O-5
The mixture was baked for 10 minutes under a reduced pressure of 100 g.

The metallized polycrystal was placed in a cylindrical perforation formed in the side of the holder along the axis of the holder, and the wax slit was 0.2 on one side.

The post-brazing process was carried out in the air with molten flux A3 using a wax containing 20% by weight of tin and 80% by weight of copper by high-frequency heating means at a heating and cooling rate of 20° C./sec.

The wax liquid temperature is 900℃. The wax melted and flowed into the wax slit by capillary action.

The resulting braze joint was flat and free of cavities and cracks in the cut piece as well as other solder defects, and the adhesion of the solder to the hexanite was good.

An embodiment of the invention is as follows.

1. Metals that exhibit a high degree of adhesive activity towards diamond and/or nitrided boron thread materials include chromium, molybdenum,
At least one metal selected from the group of tantalum, tungsten and titanium and exhibiting a low oxidizing property is preempted by at least one metal selected from the group of copper, silver, lead, tin, nickel and cobalt. 2. The method of claim 1, wherein the method is preempted from two metals.

2. The coating requires two operation steps: first forming a hard metal layer with a thickness of 0.0005-0.001 mm that exhibits high adhesive activity on diamond and/or boron nitride-based metals, and then low oxidation. The hard metal layer exhibiting properties has a thickness of 0.
The method according to claim 1, which is applied in two operational steps: forming the method to a thickness of 0.001 to 0.01 mm.

3. The coating is applied in the form of a layer of metal melt preempted from a metal exhibiting high adhesive activity on diamond and/or boron nitride based metals and a metal exhibiting low oxidizing properties, and 2. The method of claim 1, wherein the thickness ranges between 0.01 and 0.5.

4. The post-waxing process uses a liquid flux with a melting point of 500 to 700°C, and the surface heating and cooling rate is 10
~b. The method of claim 1 carried out at the melting point of the wax.

5. The method of item 4 above, wherein the liquid flux has the following composition (% by weight).

Anhydrous boronate 35 Anhydrous potassium fluoride 42 Potassium fluoride fluoride 23 6. 0.5 to 20% by weight of non-metallic filler and at least one metal selected from the group consisting of molybdenum, tungsten and tantalum. The brazing agent according to claim 2, comprising 0.5 to 20% by weight.

7. The alloy of item 6 above, wherein the nonmetallic filler is a powder of particles of 1 to 50 microns.

Claims (1)

[Claims] 1. A metallized coating is applied to the soldering surface of a nitrided boron thread and/or a diamond-based material, and the material to be soldered is closely related to the appropriate adhesion of the metallized coating to the material. The soldering is carried out by using a brazing alloy having ductile properties and a melting point of up to 1000°C, followed by a wax treatment of the metal and the material with the metallized coating. A method of brazing a metal with a boron nitride thread and/or a diamond-based material, wherein the metallized coating accounts for 30 to 32.0% of the coating. metals selected from the group consisting of chromium, molybdenum, tantalum, tungsten and titanium, which exhibit a high degree of adhesive activity against metals, and the remaining metals selected from the group consisting of copper, silver, lead, tin, nickel and cobalt, which have low oxidizing properties. and the soldering process is carried out in air in the presence of a liquid flux layer intended for the soldering of metal to metal spelter. 2% by weight, having the following composition: 13-60% copper, 5-15% tin, 5-25% titanium, 2-15% lead, with the remainder consisting of at least one metal selected from the group consisting of molybdenum, tungsten and tantalum. A brazing agent for soldering metals containing copper, tin and titanium to diamond and/or boron nitride based materials, characterized by: